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Video: Security

Col. Jack Jacobs asks: 'If not know, when?'
Oct. 10: Retired Col. Jack Jacobs talks about his new memoir, "If not know, when?" as well as the strain this financial crisis will have on the wars the U.S. is fighting in the Middle East.

Border guards sweep for dirty bombs

Watch a liquid explosive demo

Candidates and 9/11

Threat of attack on U.S. 'very real'

Newsweek: More on global terrorism

U.S. Faces Setbacks on Blocking Arms Sales to Iran

Are More U.S. Troops the Answer in Afghanistan?

Terror Watch: Yemen's Revolving Door

Did Yemen Attackers Come Back From Iraq?

Why Are Feds Threatening a Government-Secrets Expert?

Police and ‘Anarchist’ Protesters in St. Paul

Inside America's Latest Terrorism Museum

Corruption Allegations Haunt Pakistan’s Zardari

Homeland Security Reps Criticized for Hawaii Trip

FBI Makes a Powerful Case Against Ivins

Economy in Turmoil

Has your job been affected by the economic turmoil gripping the U.S.? Click here to share your story.

NBC Field Notes

NBC News correspondents and producers across the U.S. shed light on the news of the day.

Photo features

Getty Images	The Week in Pictures From celebrations to curfew, people around the world share their moments.
Getty Images	PhotoBlog View and discuss the pictures and issues that caught our eyes.